﻿#region Copyright (c) 2003 - 2008, Andreas Mueller
/////////////////////////////////////////////////////////////////////////////////////////
// 
// Copyright (c) 2003 - 2008, Andreas Mueller.
// All rights reserved. This program and the accompanying materials
// are made available under the terms of the Eclipse Public License v1.0
// which accompanies this distribution, and is available at
// http://www.eclipse.org/legal/epl-v10.html
//
// Contributors:
//    Andreas Mueller - initial API and implementation
//
// 
// This software is derived from software bearing the following
// restrictions:
// 
// Copyright (c) 1994
// Hewlett-Packard Company
// 
// Permission to use, copy, modify, distribute and sell this software
// and its documentation for any purpose is hereby granted without fee,
// provided that the above copyright notice appear in all copies and
// that both that copyright notice and this permission notice appear
// in supporting documentation.  Hewlett-Packard Company makes no
// representations about the suitability of this software for any
// purpose.  It is provided "as is" without express or implied warranty.
// 
// 
// Copyright (c) 1996,1997
// Silicon Graphics Computer Systems, Inc.
// 
// Permission to use, copy, modify, distribute and sell this software
// and its documentation for any purpose is hereby granted without fee,
// provided that the above copyright notice appear in all copies and
// that both that copyright notice and this permission notice appear
// in supporting documentation.  Silicon Graphics makes no
// representations about the suitability of this software for any
// purpose.  It is provided "as is" without express or implied warranty.
// 
// 
// (C) Copyright Nicolai M. Josuttis 1999.
// Permission to copy, use, modify, sell and distribute this software
// is granted provided this copyright notice appears in all copies.
// This software is provided "as is" without express or implied
// warranty, and with no claim as to its suitability for any purpose.
// 
/////////////////////////////////////////////////////////////////////////////////////////
#endregion


using System.Collections.Generic;
using NUnit.Framework;
using System.Collections;

namespace NStl.NUnit.Support
{
    /// <summary>
    /// A generic fixture to test any <see cref="IEnumerable{T}"/> implementation.
    /// </summary>
    /// <typeparam name="T"></typeparam>
    public abstract class EnumerableTFixture<T> : EnumerableFixture
    {
        protected sealed override IEnumerable CreateEnumerable()
        {
            return CreateEnumerableT();
        }
        /// <summary>
        /// When implemented, it creates a filled enumerable to test.
        /// </summary>
        protected IEnumerable<T> EnumerableT
        {
            get { return (IEnumerable<T>)Enumerable; }
        }

        protected abstract IEnumerable<T> CreateEnumerableT();

        [Test]
        public virtual void GetEnumeratorTReturnsNotNull()
        {
            IEnumerator<T> e = EnumerableT.GetEnumerator();
            Assert.IsNotNull(e);
        }

        [Test]
        public void GetEnumeratorTReturnsDifferenEnumerator()
        {
            IEnumerator<T> e1 = EnumerableT.GetEnumerator();
            IEnumerator<T> e2 = EnumerableT.GetEnumerator();

            Assert.AreNotSame(e1, e2);
        }

        [Test]
        public void EnumerateT()
        {
            List<T> target = new List<T>();
            foreach (T t in EnumerableT)
                target.Add(t);

            List<T> expected = new List<T>(EnumerableT);
            CollectionAssert.AreEqual(expected, target);
        }
    }
}
